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Can I replace the 11 speed 11-40t cassette with a 11-42t or 11-46t? What other parts will be needed to complete job? I.e. new chain, long chain, spacers?

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Depends on what derailleur and front rings you have.

The current Deore XT M8000 GS (which we can probably assume you have) specs say:

  • Max 11-42T cassette for a 2x11 setup
  • Max 11-46T cassette for a 1x11 setup

Additionally for a 2x11 setup there is a max 10 teeth difference between the front rings.

  • i have a 30 t front ring running 1x11. thanks – willmcGolfer Aug 18 '17 at 15:01

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